FitBench fits your data to the right curve in seconds — on device, offline.
Questions, bugs, or feature requests? Email surveys.coping-3p@icloud.com and we'll get back to you.
How do I get data in? On the Data tab, paste a table from Excel or Numbers, import a CSV/TSV, or use "Detect from image" to read a photo of a table.
How do I fit several curves at once? Add more Y columns on the Data tab (up to 7). Each column is fit independently and overlaid on one graph; the Fit tab's "All series" table compares them.
What is FitBench Pro? An optional upgrade — a monthly or annual subscription, or a one-time lifetime purchase — that unlocks multi-curve fitting, detect-from-image, robust fitting, weighting and constraints, error bars and transforms, parameter confidence intervals, and watermark-free SVG/PDF/CSV export. Your first fit and the full model library are always free.
How do I manage or cancel a subscription? On your device, open Settings ▸ Apple Account ▸ Subscriptions. Pro Lifetime is a single payment and never renews. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends.
Restoring a purchase: tap "Restore purchases" on the FitBench Pro screen after signing in with the Apple Account used to buy it.
Privacy: FitBench collects no data; everything stays on your device. See our Privacy Policy.